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desorption of gold-loaded carbon the experimental study shows that the adsorption process of activated carbon is actually a reversible process. when activated carbon adsorbs gold, excessive temperature, pressure, PH value and cyanide concentration will significantly reduce the amount of gold
In practice the gold adsorption occurs from a slurry containing fine ground rock particles and possibly a number of other metals in solution as well as organics which may poison the carbon. As the next step in the understanding of the gold adsorption process, this work assesses the impact of a fine solid suspension on the gold adsorption kinetics.
the capacity of gold adsorbed by activated carbon varies with equilibrium concentration, as shown in fig. effect of pH value on solution the high acidity of the solution is favorable to the adsorption of gold by activated carbon, so low pH value will increase the capacity of gold adsorption by activated carbon.
the reversibility of the adsorption of gold onto carbon is a function of the nature of the adsorbed gold and determines the need for cyanide in the elution process, which affects the operating
when activated carbon is used to recover gold from pregnant solutions, what amount or weight of metallic gold will be attached to the activated carbon per pound of carbon? answer although am not intimately familiar with the adsorption process that activated carbon exhibits, can get some rough numbers looking at this from a chemistry point
jan 07, 2020 ringe, morales-guio, c.g chen, l.d. et al. double layer charging driven carbon dioxide adsorption limits the rate of electrochemical carbon dioxide reduction on gold
calgon carbons experiences in the last decade have provided great advancement in our knowledge of the adsorption process and carbon specifications. calgon carbons activated carbon products offer the best value in the gold recovery industry because of the following advantages: higher gold adsorption capacities for maximum gold loadings
gold. loaded carbon values on operating plants range from 300 to 000 grams of gold per ton of carbon, a concen-trating factor of about 0001 500. portion of the loaded carbon is periodically removed from the first adsorption reactor. this loaded carbon may then be subjected to an acid wash by treating the carbon with a hot or cold
carbon by competing with gold to adsorption sites. when the Ag concentration in solution increases up to 200 ppm the carbon adsorption method for gold recovery becomes inapplicable. Ni has an effect on gold adsorption on activated carbon, however even at as high concentrations of Ni as 250 ppm residual Au in solution is still below ppm.
once gold is leached into solution, recovery is dependent on the ability of the activated carbon to have contact with the leachate and hence adsorb the gold ions.
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